I don't think these are cons really, but they are real things that may lead people to conclude Blue is not the place for them.
Change - Blue is right in the middle of transforming from a science experiment mentality and heavy R&D company where we prototyped many things for years, to an actual business. Blue's kept its stellar engineering talent and technical ambition, but it also now has customers (thank goodness) and needs to become quickly highly capable of running launch operations, and higher rate production. I've always experienced that if a company is not always changing, its certainly not growing and in fact is failing or dying a slow death. I do know some of my friends are struggling with all the change.
It is a little crazy - I guess I expect that a company trying to get millions of people to live and work in space will be some kind of crazy but that's just me. With growth and change comes more work than we can get done and that's not a bad problem to have. It does mean that there is more stress than if you want to go work at Costco, Starbucks, Boeing, etc.
Growing pains - Desks have recently been reduced from six feet long to a still lengthy five feet to make space for more people. I will share that the five footer standing desk still fits my four monitors. Parking in Kent continues to be a challenge, but should be fine in a few months when our new building is done. More policies are being implemented (but with many buildings and sites now, it's probably a good thing to bring some consistency, repeatability, and predictability to our work).